Flex Container

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A flexbox layout is defined using the flex or inline-flex values of the display property on the parent item. This element then becomes a flex container, and each one of its children becomes a flex item.

A value of flex causes the element to become a block level flex container, and inline-flex an inline level flex container. These values create a flex formatting context for the element, which is similar to a block formatting context in that floats will not intrude into the container, and the margins on the container will not collapse with those of the items.